#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
using namespace std;

struct TreeNode {
    int val;
    TreeNode* left;
    TreeNode* right;
    TreeNode() : val(0), left(nullptr), right(nullptr) {}
    TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
    TreeNode(int x, TreeNode* left, TreeNode* right) : val(x), left(left), right(right) {}
};

class Solution {
public:
    int sumNumbers(TreeNode* root) {
        return dfs(root, 0);
    }

    int dfs(TreeNode* root, int val)
    {
        val = val * 10 + root->val;
        if (root->left == nullptr && root->right == nullptr)
        {
            return val;
        }
        int ret = 0;
        if (root->left)
            ret += dfs(root->left, val);
        if (root->right)
            ret += dfs(root->right, val);
        return ret;
    }

};

int main()
{
    return 0;
}